#习题3：数字和数学计算
print ("I will now count my chickens:");
print ("1-Pus:", 25+30);
print ("2-Minus:", 25-10);
print ("3-Minus:", 25-30);
print ("4-Hens:", 25+30/6);
print ("5-Slash:",10/3);
print ("6-Percent 7%4:",7%4);
print ("7-Percent -7%4:",-7%4);
print ("8-Percent 7%-4:",7%-4);
print ("9-Percent -7%-4:",-7%-4);
print ("10-**:",3**2);
a = 21;
b = 2;
c = a%b;
print ("11-c:", c )
print ("12-less-than(<):",2<3);
print ("13-less-than(<):",3<2);
print ("14-greater-than(>):", 2>3);
print ("15-greater-than(>):",3>2);
print ("16-less-than-equal(<=):",2<=3);
print ("17-greater-than-equal(>=):",2>=3);
print ("18-less-than-equal(<=):",3<=3);


